"The Mystery of Lyle and Louise"

Gray, fine-grained, massive contact rock.

Gray to buff, with numerous ooliths and fossil fragments.

Spinel group; black, dull metallic luster; common iron oxide.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Brownish black, intermediate stage between peat and bituminous coal.

Unpolished metamorphic rock with silky lusture, red-brown colour, and clear parallel intergrown quartz crystals.

Lustrous, black 'hard coal'.

This spore-forming, thermophilic organism is commonly used for germicidal and sporicidal testing due to its ability to withstand higher-than-normal temperatures.

Light gray, fine small clasts.

Dense and massive.